package com.hiveway.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.hiveway.constant.MessageConstant;
import com.hiveway.dto.UserLoginDTO;
import com.hiveway.entity.User;
import com.hiveway.exception.LoginFailedException;
import com.hiveway.mapper.UserMapper;
import com.hiveway.properties.WeChatProperties;
import com.hiveway.service.UserService;
import com.hiveway.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    //    微信服务端口地址
    private static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信登陆
     *
     * @param userLoginDTO
     * @return
     */
    @Override
    public User wxLogin(UserLoginDTO userLoginDTO) {

        String openid = getOpenid(userLoginDTO.getCode());

//        判断 openId 是否为空，是则登陆失败，抛出业务异常
        if (openid == null) {
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

//        判断是否为新用户，是则自动完成注册
        User user = userMapper.getByOpenid(openid);
        // 是新用户
        if (user == null) {
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }

//        返回微信用户对象
        return user;
    }

    /**
     * 调用微信接口服务，获取用户的 openid
     *
     * @param code
     * @return
     */
    private String getOpenid(String code) {
//        调用微信接口服务，获取用户 openId
        HashMap<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", "authorization_code");
        String json = HttpClientUtil.doGet(WX_LOGIN, map);

        JSONObject jsonObject = JSON.parseObject(json);
        return jsonObject.getString("openid");
    }
}
